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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10902b617c86e7e978890f9c2d5bbb297e5ad6c8d419c6c8c425a310a3adcd4' 
  AND token = 'HOB6ahP7om80rVpa74iWcr3yqys/Bxie5cfJUjJVx84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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