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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ca99cc488f36bc1c7f32cb55bcfe30835279c0e3113f59bb6e8486c3083708' 
  AND token = 'goT+z3knkUulzSmj3vHbDZbd7hnTQHkUIJoJU5tyEoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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