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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c00470cb275bc9d729b5219271f8df940cdc22ea27e3d1da984b1aa24117c37' 
  AND token = 'L7Fjld0c4X3O3f+obKhHwLJMs44Jbi676eUa0McRnhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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