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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52048346885016c5bca88c5771cde5d901de6004b8c88cb21de40677f7fd3535' 
  AND token = '89sxquDjOTCv/0HDzAXY2g1TW1cm3uXModBmPbMFVF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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