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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa98d57368465977d0ab511322944b8a5c9b9e40183954de0915d29018e53fa4' 
  AND token = 'j4vM1jX4v8tGHqb923ISlMwX9dMFATJai7ebhko/pRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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