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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef427b6e1890f03bd46ff1d9d212e9237075fa29b8f795e9e8b4d985a4ea4719' 
  AND token = '6/P/oEmBFcUwp7t7clZreKm/Cg8Wp00zRwCX06cv8L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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