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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f14293f7ed65b04d047560db7afce81c1c10174c2c56c9a4a50ce850df24a2' 
  AND token = 'aZCDe4d4A0kPUFhEyERe2N6a0KLRujRO91yPuu3F30k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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