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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd0708160b0cd1f06f5ac06615bf805a7d6225263ed4b7e6a0266dd3bcafd61' 
  AND token = 'fHs8y6zDf9cGyHPx11YaoI2obejEFAXMvVgvoNSxtb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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