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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9c93c2e814febe48559bdd6f7ade168f3a56ca652ee827834a3f841a83fdf9' 
  AND token = '7+dZSRSYg2yDFfVxuF8d3aH9FwlyBnbTG310SMkzDqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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