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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d7b394dd4fb4c06f4a5630fd145b6ec2b380df345d0817aaa821e7b2ef7f25' 
  AND token = 'Jc02hENW2JvM7MQKelC7IuI45imgViZq/Tfc5gVasoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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