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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed3828ff7654b554731937b69b8d1dc0e9162900368119ba840eae74ae0a154' 
  AND token = '41Rzc8YwYffyhhAAZoHP5+ZSHKAoz5gQbJMsh5WZQ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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