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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc9fa981cf7e5af753a426176f5e72988f655386ec5f367d102957d4cb4eb83' 
  AND token = '8E2KtDy9J42DAGa4paj/QGVX0uzWNItefvoJNwDeRP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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