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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8a2eeb2e9e5fb6d3b2793a06f2a30bc447db357a6a35c9952795722a7e540e' 
  AND token = '97YJ90gfefHBbNlAcXESdBzHh84O0JSTQphqTkCo5h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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