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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6652d1c3c5c936d68ef18eb6a5ba0fe4bd15d6e4cc81b20ba7da2b4342d9962' 
  AND token = 'ceMynM7ZdJy2s+Hico7UCTaMosvMFVLlykrOejVtMz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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