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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc21d3feb48d72d4e1445ef9ca4efe2dc45068317abe012b405fad532ce88f2f' 
  AND token = 'lx5lmj2MW/cID+vl82PknwtHx1P0opUhsCSrY3iMUPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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