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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2313f15300bcb289b9764e78c0c733ac3783f4dc19181eab4d9a5924b366e3' 
  AND token = 'h7mOekWZZ49nC2AI+u5v2BbG91muU5m0wBJZaUixcxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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