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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06b08e8f5b1194ab5c5d6398a275cadb06828b3104849e4b2bb0ce1aeaa185b' 
  AND token = 'ARAT4O84l0XodRzfFSmJm3c2Pq21G16KfcKXjQQN7B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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