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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b6ec6049a1c049111c20312cc8ef662333acf5fa06b9bf9434dac7bdf1986d' 
  AND token = 'EWchwWelAfbN7691tohwU5AHKm7yHiWEVlIE8JymKTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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