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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef71b08f9d03e167ac96eb6ba537e842ef413042face4513d029398d2f5d6ae7' 
  AND token = 'hl2LOW5YMJFbnEzTm07p8jlBmbi7RdG4OpdNp+lXidM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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