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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa374663ef9278d042ee7b46518637863c6a4a40033f3914f68be5314006810' 
  AND token = 'P19w4g8aPw0bA5coWZ6LIBpUCpXeTBdBqZvk5Oa+fKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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