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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9498c558d0b19a3be582cecbf236e3d6299f257a3d1eee4ecfb610df375348ae' 
  AND token = 'rh2flUQccaWgX5ex2au6sZIQZZQ0RmV2cagf/A/cb5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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