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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d32c393f70024863968a583e1c604314a6eddad259c90064fa09a756cf9106' 
  AND token = 'EiDA/rQT3dPeMo8jFm7xe9CJFXy+JJ9FWbv7sOd+7Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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