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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6314673954df8c288c6eb2137e3e08de2edcf9ebfd05c59568fa74c37eb48f5' 
  AND token = 'ZlRAkUOhtlGYzJco1BLcs5eEt8K0esHLpKcawUx2wvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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