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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f05c2425734504244e801d0a2ccc1b4639997fa4540dac4cdb10d9314300ab' 
  AND token = 'VbmLff25YegjufHZ0SjR9STNrh2VW6SoX3H4qQkrh4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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