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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c451fb34e6e51d169d266dece9532cb4adf7daa7c912ad300c58b2e032db91f' 
  AND token = 'moSHNcS3wJJ6ZCMkea2JFEVx4Siq9jGkohubld1In/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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