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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384c0c22f442494b1bd38c7f6ecef3b1bf9266c839cedfe7eba9bb3cf76693b6' 
  AND token = 'oewJzXJz03D2ZtANkQg7lX74FatgimffIqyKixYr1mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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