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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfcc06bbcdee75ac8c8ad1dc661383b73a4f0cb815af7dedf5fa9f662b13dc39' 
  AND token = 'H4RNhCHz99gI/72K/sksHblYWG5MraMg4evmnda2QAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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