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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cb928447cb1b81d1453677802f6e6af1c09e794be7f5912c4dab12ce17ba56' 
  AND token = 'B8nwbw1emvxQOC03MBuN8b6MttxuV9EsB8uQyiVFoNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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