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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92987795c59ab86de1cbd2468f9c2fb90c86f891b3fbcaf83389de42d545b4ab' 
  AND token = 'V/9+dn/sU2iSt0PnoJfg2UwDT0mN/MN2swy5zqi7TC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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