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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8678e222c5018b6d0abcd763cf64f993c2adbeddf82b5a2b9cea95ae3bbfa0fd' 
  AND token = 'c7qfnFJuq3Bhr0Xpdyl2piZZDoKSntdiXWMOOC5hhSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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