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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebd03bab3b9d329e7f44ca36d9428d0cb3c03e0959bf7fa9c739eeb8973497f' 
  AND token = 'PSksBkKcFt7HumMXi7vWpfV8Xdh8DUpYRBIKDXqrVR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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