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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368b85477e654d82801a57f68a07239ae1ce000ead1dddfacafba3bcd1d4f529' 
  AND token = 'QezkvOjHQkHYAcAkBFabxbvSPWLL2tBtt39U4vGtXCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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