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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce31c1b0e677a4107deb63ffa8e3895c38a12dab2e206292eeb144814d5f9b8' 
  AND token = 'yRmEc8exmrXtIASRszza1dkeois6dcka3ZSEz44Fico=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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