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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b3eaf9bff6003fb497f6100421ef7db4602c9fd42b3758131b83309c6865be' 
  AND token = 'vXDc16Vxw0cVKAL9f21kJgPCpjDSViALZjLHWGGXGHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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