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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f50df58811424b7e4232564e7338363eeed0e3089683e69f4ba16ddeda04cc' 
  AND token = 'Z9XC+iVBb8rP8CiQXd9/SnefvRNuZzc7LwFAEp+i3ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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