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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd85e8b4b5b66706b9fb42d928f38aaf63aa326d35e0d7dc6e7d8f90a4ece83' 
  AND token = '2Du1sI79ifBm6kRJi+8MuWvi+jUiw2GYbFojaTAla7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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