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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d22927115ab3eeee94955b032be5b1da61f81ad302ecdc85aa890c6c210169' 
  AND token = 'vH/r46LUHzMGPdgyq75qJhXgM8XN+WTQwkV3V2VbQbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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