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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91ea39ac1cd7c7730e380232a67476f89dacaf0fa958be090eda3a13d989c72' 
  AND token = 'l3OWoRKhz7FXGag/2Q9sFLJ/pnxCEigyLeSLwEaUB/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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