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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e024bc899fde0d78bd3c225df2433124fbcd9d7d9db7b6bbfa651a813f9217' 
  AND token = 'j4RtBxijM5ukUd3SyXDAzUNKDaSz9blxGIpTPJRj+Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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