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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494e37cea3b37fc7efed1cc5117b3073d0ba0a216b5d072315fed9adab1c5d48' 
  AND token = 'cbrfrU81KZS2MIc4DOjPI3TTvg/1HjzT/ldh+XP5Zv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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