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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd15a91f4685eb52d88a3f51b74047a04274e311c8ec847d6cce19068232ba6' 
  AND token = 'c36UJejage2iZILpv8WZ7Nk9sfEScc0oPpvLj1gIcQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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