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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd419efc21d5f437aa1dd8e54d01642a213604bc319e7713f9ddec41013baf0f2' 
  AND token = 'eeMW0AaYrScrDQwWIDlRzCZ5heIrf6GwSu//s+aulQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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