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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4e45da94e43d4d3f8effb30712e1e954171a57c23cf165412a312dce4efb6e' 
  AND token = 'Xez4QxozK1+Fi2p+UCE4g7EFMEwCcrugHAdd20xwJ34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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