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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c196c254af108cdeb2324716d95219fed77f1bb507e270beb951f8ef0df1210' 
  AND token = 'HgeYFg+78c6QMbC5DsiXbwaTWzTeliSLSAU1F/wAz/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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