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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6e7e453533cec46fd622a7df21e7f18c1ebe0c2e573197ea884e35159293de' 
  AND token = 'zppUK0x78tSj+OfKyah1swjc7qEjAR/Mc6uBZ3UOli0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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