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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55e3f79a982e11679e20252f4204006b0af82c07753e885efd953fa2bb7e448' 
  AND token = '19B6dRzK8yQh3dkDT/C+XOm0nCeHfQP3smJuRtWzwPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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