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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1431b05abd615a9f54b7c550c61b10fdbd1020f17f0f14580770564072481d64' 
  AND token = 'HkXp0us1Ibkx+WAohO4TrCzdZ5dLc9Pm7+T8Kab0cwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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