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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42c6d3169c542a5089d557ac872e8b63231f1b5885c771016e9f0abd2fa8acf' 
  AND token = '7sr9ck20cFR0AK7Dylumu9GLzExFQiC/JH1PIviw4D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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