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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3c9bfb7fc39b84a38d8cd5c075f1d99f5dc9047fc3e50ded2bc48d0561c01d' 
  AND token = '+yPog8std3Ini074KS8fQtCAKm9PP0dHkdvMUGue9Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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