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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ee389ceae87cc9a396b003955364d23246803a6d467332eecf10e56f243fe1' 
  AND token = 'N+4pS01Yr77qLE65OO2r+QMStxpsnyfCYDS6FAttqPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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