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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d448d23025b57579ebd25df6614b081d443f494f16e9045d12b51980615d75' 
  AND token = 'cKtt1O8O9TDk31GBKSFbwpaeDTcFHT/SzMDUTnpuIfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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