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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebcc0af934c326a419b22462737c961d7df453dc5387b30212a2a222f987686' 
  AND token = 'UZPYX7rxA1sddp7P15K8g8SsGnSNZoeE95f3TY0t7w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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