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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af3da87b4d288b48f75e32f180f4236c4d5374b9aeff5f9f0b0be62eaeabe2b' 
  AND token = '2HqraE4+GaLaVeGaRxN7/TeimgaQaSOls2MxQ5KTJpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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