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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece041a402238541f792c5e2acab9489298023f593fe8222f3b1436232f1f45d' 
  AND token = 'LYjolmQyqQift4Z7ySi8LKB08qGmTKPhIA+MN6XPOyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}