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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4af471999ceef675284126a3698d5a25799ca581997f893171c78cb1ad83c3b' 
  AND token = 'QE0PNlt+isCDpmYYDzGS0eSdl/e1bSEfr4f/XjyVVUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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