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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2fb069fe6ec64597986151bc633cb7a0917a2d20badaa99222a977afd23e40' 
  AND token = 'fpS+hqUP69q3iluwS8MTnsp573mwN8IZFdVemMn6/XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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