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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6531b380c5cd11ad0b240327289564e0f8860165b960974e812a9b3f7791d531' 
  AND token = 'J9wMYnBBJ2iEnnlLTwG8RdSKy0opt5Oy1bxFWoN7gXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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