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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c07ee6c2c034f334967b9102b358bddc6e78eb91fb560ade9cf818b062a2406' 
  AND token = 'krxLMfjnSF/pCOrTYu8I5IMJK1NEFJjnfKCePt5puX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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